The velocity of water in a river is `18kmh^-1` near the surface. If the river is 5 m deep, find the shearing stress between the horizontal layers of water. The coefficient of viscosity of water `=10^-2 poise.`

Explanation

To find the shearing stress between the horizontal layers of water in the river, we can follow these steps:

### Step 1: Convert the velocity from km/h to m/s
The given velocity of water is \( 18 \, \text{km/h} \). We need to convert this to meters per second (m/s).

\[ \text{Velocity in m/s} = \frac{18 \, \text{km/h} \times 1000 \, \text{m/km}}{3600 \, \text{s/h}} = 5 \, \text{m/s} \]
...